I haven't tried those yetis or other newer ones, but "Leucistic Penis Envy Uncut" has been my personal strongest strain over all and I saw someone on shroomery that I know for a fact has been involved in at least a couple of those say similar if I am not mistaken.
The ladies, they go crazy.
Yeah PEU i dont think the leucistic is going to be any better than the normal version, both are probably about as potent as it gets i would assume. Did they look like the pictures i posted? Can you post some pics of your leaucistic PEU's i am interested to see what they look like during growth as well as after harvest.